allan dalzell



(No Model.)

J. A. DALZELL.

IELEGTRIO ARG LAMP. No. 274,916. Patented Apr.3, 1883.

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7 UNITED STATES PATENT OFFICE.

J. ALLAN DALZ'ELL, on NEW YORK, N. Y.

ELECTRIC-ARC LAMP.

SPECIFICATION formingpart of Letters Patent No. 274,916, dated April 3,1883.

Application filed March 25. 1882. (No model.)

To all whom it may concern Be it known that I, J. ALLAN DALZELL, acitizen of the United States, and a resident of New York, in the countyof New York and State of New York, have invented certain new and usefulImprovements in Electric Lamps, of which the following is aspecification.

My invention relates to that class of lamps known as arc-lamps, and theobject of the invention is to make the magnet system by which the feedof the carbon is controlled more delicate and sensitive in its action.

My invention consists in the combination, with the lifting or actuatingdevices for the teed mechanism, of an electro-niagnet composed of twomovable spools or helices, with their contained cores connected by abridgepiece, which is pivoted at its middle, said electro-magnet beingarranged with relation to the other parts in the special mannerhereinafter set forth.

My invention also consists of certain coinbinations of parts that willbe specified in the claims.

Figure 1 is a side view of the operative portions of a lamp embodying myinvention. Fig. 2 is a top view of the lamp. Fig. 3 is a top view of theclutch. Fig. 4 is an end view of one of the spools or bobbins and itscontained core, showing the form of thepole-piece of the core. Fig. 5shows the link by which the piston'rod of the dash-pot is hung from thecore of an electro-inagnet. Figs. 6, 'i, and 8 show modified forms ofclutch.

Referring to Figs. 1 and 2, A represents the base-plate of the lamp, andF a vertical plate, mounted upon the base-plate, and serving as a meansof support for the main circuit spools or helices G G, the cores ofwhich are secured directly to the plate F and project horizontallytherefrom. The helices G G are wound so that the projecting end of thecore for one spool is north while that of the other is south. The plateF is by preference of iron, so that the cores of the two spools orhelices F F are magnetically connected, and form virtually the poles ofa horseshoe electro-magnet.

E E are two supporting plates or rods, one of which is connected to thebase-plateA,and the other by preference to the upper portion of theplate F. The plates E are connected at their upper ends in any ordinaryor suitable manner to the parts by which the lamp is supported.

H H are bobbins in a derived circuit around the carbons of the lamp.Said bobbins are wound in such a way, or their ends are so connected tothe general circuit, that the current circulating in them tends todepolarize their cores, or, in "other words, to impart to said cores apolarity the opposite of that which is induced in them owing to theirproximity to the ends of the coresofG G. Thecores of the spools G G are.screwed to a bridge-piece of iron, N, after the manner ordinarilyemployed in construct i ng horseshoe electro-magnets, and thebridge-piece N is attached atits center to a horizontal rock-bar, K,pivoted in plate F, and the plate E opposite thereto. readily seen, whenthe electro-magnet is thus constructed and mounted, its weight ishalanced about a central point, so that it will act with greatseusitiveness and rapidity in obedience to the changes of magneticcondition of its core and ot' the opposite or attracting magnet. Therock-shaft K is curved at its central portion, so as to make room forthe carbon-carrier B, and to also form a crankarm from which is hung thelink L, which supports and impart-s movement to the clutch. Thepole-pieces oi the bobbins G and H have the form shown in Fig. 4, whereM represents apole extension projectiugat right anglesfro n thelongitudinal axis of each core.

When the lamp is not in action, the bobbins H H are out of line with thebobbins G G, as indicated in Fig. 1, so that when the cores aremagnetized the bobbins H H are carried to.- ward the horizontallinejoiuiug the magnetic axis of the bobbins G G, thus causing the bar Kto rock and lift the link L and connected clutch. Owing to the poleextensions M, and t0 the manner in which the bobbins and their cores arepresented and move with relation to one another, great range of movementis obtained, and a consequent increased delicacy of action ensues.

G is the clutch-lever, resting at one end upon the base-plate A by anadjusting-screw, and connected at its other end to the link L.

The clutch proper consists of a projection from lever O, which enters aslot or groove in As will be ICO the side of the carbon rod or carrierB, and is so formed that when the'lever is lifted at one end the clutchis turned slightly, and its two diagonally-opposite edges will be causedto engage with the two sides of the groove or slot, and thus stop themovement downward of the carrier, or hit the carrier it the lever bemoved still farther.

Fig. 6 shows another clutch device differing but slightlyin form fromthat shown in Fig. i). Fig. 7 shows a form in which two clutchingprojections enter slots or grooves in opposite sides of the rod. Theseclutches, like that already described, are suitably mounted upon aswinging lever or other device, so that when they are operated they willbind against the sides or edges of the groove in the carrier insubstantially the same manner as the clutch upon lever U. Fig. 8 is anequivalent form, in which a web or projection formed upon the side ofthe carbon-carrier enters a bend in the clutch-lever. In all theseforms, as will be readily seen, the carbon-carrier is prevented fromturning about its horizontal axis.

The dash-pot is represented at R. Its piston-rod is actuated by a link,S, which is attached to a pole projection of the core of one of thebobbins G.

The general operation of a lamp thus constructed does not differmaterially from that of other well-known forms, in which main andderived circuit helices are employed. When no current is passing, thederived-circuit electro-magnet H H N and its connected parts are causedby a spring, P, to assume a position in which the clutch D does notengage with the groove in the carbon-carrier, so that said carrier isfree to drop until the carbons are in contact. When the current flows,the derivedcircuit magnet H H N swings, tilting the lever 0, and causingthe clutch to engage with and lift the carbon-carrier. When the arclengthens, more current flows in the derivedcircuit helices, thustending to depolarize their core and lessen the mutual attractions ofthe main and derived circuit cores, so that the re tractor carries theparts into a position where the clutch will release its hold and allowthe carbon-carrier to move downward to compensate for combustion.

It is obvious that the construction of the clutch or feed-controllingmechanism D may be varied without departing from the invention.

It is also obvious that the bridge-piece N might'be of some non-magneticmaterial, in which case there would be two straightbar eleetro-magnetsinstead of a horseshoe-magnet; but the weight of the parts would stillbe balanced, as before.

Instead of balancing the parts of the dcrivcd-circuit electro-magnet andmaking them movable, I may mount them so that they will be stationary,and make the main-circuit magnet movable instead.

The connecting or bridge piece N might be curved instead of straight,and integral or of one piece with the cores of the bobbins G G.

The connections of the main and derived circuit helices are made in anyof the wellknown ways.

It is obvious that the arrangement and method herein described ofmounting the electro magnets may be applied to lamps employing otherforms of feed-controlling mechanism in place of the clutch devicesdescribed.

What I claim as my invention is- 1. The combination of the horizontalfixed bobbins G G, the horizontal movable bobbins H H, arranged to swingpast or transversely to the magnetic axes of bobbins G G, thecross-piece or bridge N, pivoted at its center, and carrying atits endsthe bobbins H H, projecting transversely therefrom toward the parallelfixed bobbins G G, and means for actuating the clutch mechanism of thelamp.

2. The combination of the horizontal fixed bobbins G G, provided withvertical polar projections, the parallel movable bobbins G G projectingat right angles from the cross-piece N, the rock-shaft K, the link L,connected to the rock-shaft, and the tilting-lever carrying a clutchingprojection arranged to engage with the two sides of a groove in thecarbon-carrier.

3. The combination of the horizontally-projecting fixed bobbins, polarprojections for the cores of said bobbins extending at right angles totheir magnetic axes, movable bobbins whose cores are provided withsimilar polar projections, asupporting crossbar or bridgepiece, by whichsaid bobbins are connected, pivoted at its center, so that the weightsof said bobbins are balanced, and means for actu ating the clamp orequivalent devices of an electric lamp.

J. ALLAN DALZELL.

Witnesses:

H. G. TOWNSEND, Tnos. TOOMEY.

